Lepton flavour universality in rare b → s transitions is tested for the first time using B0s meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^−1. Branching fraction ratios between the B0s → ϕ e+ e− and B0s → ϕ μ+ μ− decays are measured in three regions of dilepton mass squared, q^2, with 0.1 < q^2 < 1.1, 1.1 < q^2 < 6.0, and 15 < q^2 < 19 GeV^2/c^4. The results agree with the Standard Model expectation of lepton flavour universality.

Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays. PHYSICAL REVIEW LETTERS, 134(12), 1-15 [10.1103/physrevlett.134.121803].

Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays

Carbone, A.;Ferrari, F.;Galli, D.;Patrignani, C.;Spedicato, E.;Villa, A.;Zenesini, F.;
2025

Abstract

Lepton flavour universality in rare b → s transitions is tested for the first time using B0s meson decays. The measurements are performed using pp collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9 fb^−1. Branching fraction ratios between the B0s → ϕ e+ e− and B0s → ϕ μ+ μ− decays are measured in three regions of dilepton mass squared, q^2, with 0.1 < q^2 < 1.1, 1.1 < q^2 < 6.0, and 15 < q^2 < 19 GeV^2/c^4. The results agree with the Standard Model expectation of lepton flavour universality.
2025
Aaij, R., Abdelmotteleb, A. s. w., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adefisoye, A. a., et al. (2025). Test of Lepton Flavour Universality with B0s → ϕ ℓ+ ℓ− Decays. PHYSICAL REVIEW LETTERS, 134(12), 1-15 [10.1103/physrevlett.134.121803].
Aaij, R.; Abdelmotteleb, A.  s.  w.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adefisoye, A.  a.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Agapop...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1011614
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